Merge branch 'patch-2' of https://github.com/speigg/three.js into dev

src/core/EventDispatcher.js

@@ -77,6 +77,7 @@ THREE.EventDispatcher.prototype = {
 
 		if ( listenerArray !== undefined ) {
 
+			listenerArray = listenerArray.slice();
 			event.target = this;
 
 			for ( var i = 0, l = listenerArray.length; i < l; i ++ ) {